Answer question three Question 11. The coil of a PMMC voltmeter is 40 mm Jong and 20 mm wide and has 120 turns on tThe control spring exerts a torque of 90- 10-6 N - m when the deflection in 100divisions on full scale deflection. If the flux density of the magnetic field in the air gap is0.4 Wb/m', determine the resistance required to be connected in series with the coil togive one volt per division. Assume the resistance of the coil to be 1.5 kfl.2. Two lamps LI =50 2 and L2= 100 2 are connected in series with a 110V DC sourceFind the error in the measure power in L1 using voltmeter -ammeter method and in idealreal conditions, given that the internal resistance of voltmeter is 120 k2 and that of theammeter is 0.2 m2, when (a) voltmeter is connected near L2 than the ammeter and (b)the ammeter is connected near L2 than the voltmeter.3. With the aid of illustrations and suitable expressions, explain how ammeters andvoltmeter can have their range extended.Question 21. A set of physical length measurements were taken and results are as follows: 1.45, 1.44,1.57,1.48, 1.43, 1:46,1.54,1.49,1.41,1.60 m. Assuming that only random errors arepresent, Calculate Arithmetic mean, average deviation, standard deviation and variance.2. In a balanced 3 phase circuit power is measured by two wattmeter method. If the ratio ofthe two meter readings is 3:1.5, determine the power factor of the connected load.3. Explain the main difference among indicating, recording, integrated and null detectorinstrumentsQuestion 31. A ring core current transformer of ration 1000/5 A is operating at full primary currentwith the secondary burden of non-inductive resistance of 1.1 2. It's exciting current is1A at a power factor of 0.45. Caleulate: the ratio error at full load, assuming that therehas been no compensation, and the phase angle.2. A load takes a current of 2.6 A, a non-inductive resistor connected in parallel take 2.4Awhen connected across a22 V supply. If the total current take from the supply is 4.6 in thethree wattmeter method of single-phase AC power measurement circuit, calculate thepower consumed by the load, load impedance and load power factor.3. With an illustration explain the operation of PLCS and state their main advantages overhard wired relays.

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Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

The coil of a moving-coil voltmeter is25 mm long and 25 mm wide and has 60 turns on it. The control spring exerts a torque of 1.58 x 10 Nm when the deflection is 100 divisions on full scale. If the flux density of the magnetic field in the air gap is 5 wb/m², estimate the resistance that must be put in series with the coil to give one volt per division. The resistance of the voltmeter coil may be neglected
The armature of a 4-pole dc machine rotates at 840 rpm. The armature length and diameter are 40 cm and 30 cm respectively. The flux per pole is 65 mWb. Each armature coil has 5 turns, and develops an average torque of 3 .0 Nm .a. Find the coil emf, current, and conversion power .b. Make a rough estimate of the copper (I2 R) loss in the coil assuming it is made of 1.0 mm 2 copper wire, and the losses during operation raise the temperature to 80 0 c
A PMMC voltmeter with a resistance of 10 ohms gives has a coil of effective depth of 3 mm and a width of 2.5 cm, the coil has about 100 turns. The flux spread in the air gap is of 10mWb/m2 . The spring has a constant of 2 x 10-6. Then calculate, i. Deflection torque produced by the coil, when it is connected to 20V to measure. ii. Deflection made by the pointer, when the meter is to measure a voltage of 10V. iii. Analyze the reason of fixed the voltage coil in dynamo type wattmeter?
Assume that the magnetic core shown in the fig is made up of soft steel casting with a cross sectional area of 200sqcm and an average flux length of 100cm if the coil has 500 turns. Determine the following. a) the amount of current requiered to produce 0.03 Wb of flux in the core. b) The relative preamibility of the core at the current level found in part (a) c) The reluctance of the core.
A PMMC voltmeter of range (0-300V) with a resistance of 10 ohms gives has a coil of effective depth of 3 mm and a width of 2.5 cm, the coil has about 100 turns. The flux spread in the air gap is of 10mWbm. Calculate, i. Control torque produced by the coil, when it is connected to 50V to measure. ii. Spring constant, when the pointer makes 30o deflection for the measurement of 120V then the total deflecting torque is 7.5x10-3. iii. Explain how the pointer moves in a Dynamo type wattmeter with relevant sketch, and also mention the consequence of removing the resistance connected in series with the voltage coil.
A rectangular moving coil of a milliammeter is woundwith 30 turns. The effective axial length of the magnetic field is 20 mm and the effective radius of the coilis 8 mm. The flux density in the gap is 0.12 T and thecontrolling torque of the hairsprings is 0.5 × 10-6 N m/degree of deflection. Calculate the current to give adeflection of 60°.
A magnetic circuit consists of silicon steel of 3000 permeability and an air gap.The length of the steel core is 10cm and the air gap is 2cm. Both have the samecross section of 1.5 sq. cm. A current of 1⁄2 ampere flows through the windings toproduce 2351 maxwells flux. How many turns are there in the coil? ans: 5000 turns
A coil is wound uniformly with 500 turns over a steel ring of relative permeability 900, having a mean diameter of 40 mm cut with air gap 0.2 mm and cross-sectional area of 50 mm2 and the flux density in it 0.5T. Find the current of passed through the coil and total .reluctance of ring
The magnetic circuit shown in Figure P13.11 hastwo parallel paths. Find the flux and flux density ineach leg of the magnetic circuit. Neglect fringing at theair gaps and any leakage fields. N = 1,000 turns,i = 0.2A, lg1 = 0.02 cm, and lg2 = 0.04 cm. Assumethe reluctance of the magnetic core to benegligible.
An eight-pole, 24 KW, 124 V, DC machine has a duplex LAP-wound armature which has 72 coils with 6 turns per coil. Its rated speed is 3000 RPM. Assume no dead zone Find the constant K and the flux per pole to produce the rated voltage at no-load conditions Select one: O a. K = 68.76 and flux = 5.71 mWb / pole O b. K = 86.76 and flux = 4.55 mWb / pole O c. K = 78.86 and flux = 5.33 mWb/pole O d. None
An iron ring of mean length 50 cms has an air gap of 1 mm and a winding of 200 turns. If the permeability of iron is 300 when a current of 1 A flows through the coil, find the flux density.
Assume that the magnetic core shown in the fig is made up of M19 29 gauge sheets with a cross sectional area of 25sqcm and an average flux length of 60cm if the coil has 350 turns. Determine the following. a) the amount of current requiered to produce 0.039 Wb of flux in the core. b) The relative preamibility of the core at the current level found in part (a) c) The reluctance of the core.

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